1. CW 73010 is a synthetic variety with 224 parent plants that were selected sequentially for multifoliolate leaf expression and for resistance to Phytophthora root rot and Aphanomyces root rot (race 1). Parent plants were selected from crosses between selections from three-year old Minnesota and Wisconsin yield trials. Yield trial source varieties were derived from various populations that were developed by phenotypic recurrent selection for high relative feed value (using Near Infrared Reflectance Spectroscopy), and for resistance to one or more of the following pests: bacterial wilt, Fusarium Wilt, Verticillium wilt, Phytophthora root rot, Aphanomyces root rot (race 1), anthracnose (race 1), and Leptosphaerulina leafspot. Parentage of CW 73010 traces to the following germplasm sources: WinterKing, 9326 and miscellaneous Cal/West Seeds breeding populations. Approximate germplasm source contributions are as follows: M.falcata (8%), Ladak (6%), M.varia (27%), Turkistan (3%), Flemish (49%), and Chilean (7%).
2. CW 73010 is adapted to the North Central and East Central areas of the U.S. and is intended for use in the North Central, East Central, and Great Plains areas of the U.S. CW 73010 has been tested in Wisconsin, Minnesota, Iowa, and Pennsylvania.
3. CW 73010 is a dormant variety with fall dormancy similar to FD class 3 check varieties. Flower color observed in the Syn.2 generation is approximately 100% purple with a trace of variegated, white, cream, and yellow.
4. CW 73010 has high resistance to anthracnose (race 1), bacterial wilt, Fusarium wilt, Verticillium wilt, Phytophthora root rot, and Aphanomyces root rot (race 1), with resistance to pea aphid and stem nematode, and moderate resistance to northern root knot nematode (Meloidogyne hapla). Reaction to spotted alfalfa aphid and blue alfalfa aphid has not been adequately tested.
5. Seed increase of CW 73010 is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (Syn. l), foundation (Syn.2 or Syn.3), and certified (Syn.3 or Syn.4) classes will be recognized. Production of Syn.3 foundation seed requires consent of the breeder. Breeder seed was produced under cage isolation near Woodland, California in 1997. Sufficient foundation seed for the projected life of the variety will be maintained by Cal/West Seeds. Stands of foundation and certified seed fields are limited to 3 and 6 years, respectively.
6. Certified seed of CW 73010 will be available in 2003.
7. No decision has been made regarding Plant Variety Protection.
8. This information can be forwarded to the PVP office.
Experimental Designation: CW 73010.